131440291 has 4 divisors (see below), whose sum is σ = 132443784. Its totient is φ = 130436800.

The previous prime is 131440261. The next prime is 131440297. The reversal of 131440291 is 192044131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131440291 - 2⁷ = 131440163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131440297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501550 + ... + 501811.

It is an arithmetic number, because the mean of its divisors is an integer number (33110946).

Almost surely, 2^131440291 is an apocalyptic number.

131440291 is a deficient number, since it is larger than the sum of its proper divisors (1003493).

131440291 is a wasteful number, since it uses less digits than its factorization.

131440291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003492.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 131440291 is about 11464.7412094648. The cubic root of 131440291 is about 508.4436611793.

The spelling of 131440291 in words is "one hundred thirty-one million, four hundred forty thousand, two hundred ninety-one".